Hi,
I am trying to write a module in which I have an ioctl through which I
pass a userspace structure. The handler for the ioctl looks like
below.
203 int
204 ohsm_enable(unsigned long arg)
205 {
206
207 int ret = 0;
208 struct ohsm_instance *instance;
209 struct ohsm_userspace ohsm_user_info;
210
211 if (copy_from_user((void *)&ohsm_user_info,
212 (struct ohsm_userspace __user *)arg,
sizeof(ohsm_user_info)))
213 return -EFAULT;
214
215 return 0;
But this crashes every time and UML gets killed with memory fault. Are
there any known issues with UML and copy_from_user ?? Any guesses what
could be going wrong ?? I am not able to put a breakpoint in
copy_from_user() because it gets called way too much of time.
Thanks for any suggestions... apparently this runs fine on a normal machine.
--
Thanks -
Manish
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